well, it isn't in any cirtin place, but in diamond you can catch one in the route next to canalave city. you can catch it at any time, but i caught mine during the day.
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Ditto in platinum appears in the trophy garden. If you save before you talk to the owner of the trophy garden, you can talk to him. if he does not say he saw a ditto then restart the game and reapet it until you do. Hope this helps!!!
you can catch a Ditto if you talk to Backlot every day for a long time. He will say that he saw a ditto there. Then, you can catch a ditto in the trophy garden.
At the trophy garden, rarely. it's in Pokemon platinum.
The Trophy Garden is the only place to get Ditto in Pokemon Platinum, without trading or cheating of course.
Ditto you can find it in the Trophy Garden at the Pokemon Mansion on route 212. Talk to mr. Backlot after you get the national pokedex. Hope this helps! :)